20 Trailblazers Lead The Way In Audi G28
20 Trailblazers Lead The Way In Audi G28
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How to Replace an Audi G28 Engine Speed Sensor
Charles the Humble Technician shows you how to replace the G28 Engine Speed Sensor. The sensor is located at the edge of transmission, above the flywheel gear. It sends a message to the ECU through an uncolored wire T55/49, then to the tachometer on the instrument cluster.
1. Engine Speed Sensor
It is located on the outside of the transmission, above the flywheel ring gear the G28 Engine Speed Sensor sends signals to ECU pin T55/49 via the grey wire. The ECU then utilizes this information to regulate the flow of fuel, timig and boost. It also sends an indication to the G5 Tachometer within the instrument cluster.
The sensor is used to link with the G40 Camshaft position Sensor. The ecu must know when the crankshaft reached TDC, and the position of the camshaft, to trigger the spark and injectors.
If this sensor fails the ECU will throw the P00160 error, which means the Crank Shaft and Intake Camshaft are not in sync and possibly indicating the chain is stretched or a jump link on the upper timing chain. The code will not appear without the additional information provided by other sensors (G4 or G40).
It's a bit tricky to test since there are several connector pins, and each has its own functions. The best way to do it is to measure the resistance between the ECU and the sensor. It should read about 1000 ohms when it is at full operation. Check for evidence of coolant or oil in the connector bay if you have problems with this part.
2. Injectors
Yesterday accelerating full speed from highway paytoll i had a big cut in power like the engine is out of gas or the injectors are not firing anymore. I pulled out the spark plugs this morning and found that 3 were soaked in gasoline, and the fourth was dry. When I crank the engine, there are no sparks i put tissue on top of each injector hole, the 3 drenched with gazoline leap out, however the 4th stays closed. I inspected the ground connection on ECU pins 14/55, 30/55 and 48/55. i get zero Ohm. I'm assuming the issue is somewhere else.
I also tried to reset the PID but without success. The car is able to start if the G28 is disconnected and runs fine when it is plugged in, but still has intermittent misfire issues at higher RPM. The coolant sensor (G62), even when unplugged, still shows a temperature of -49c. Also i noticed that the oil pressure gauge in the cockpit is showing 2 bar, whereas the actual pressure is 0.0 when i rev the engine.
I'm not sure what to do, i think i've pretty much eliminated everything else. I'm afraid i may have missed something. Please let me know should you have any replacement key for audi a3 suggestions! TIA!
3. Fuel Pump
The fuel pump in the g28 is activated by a signal sent from the RPM sensor. The replacement car key audi GM-style sender is the same as the G4 and both function in the 80 100 200, UrS and RS2 cars which is why you can easily locate one at a salvage yard or from a parts store. It is simple to test them - just put your DMM into resistance mode and test the distance between pins 1 and 2 (with the bump on the connector's edge facing up). They must be infinite Ohms.
4. ECU
Our 20vt turbo (3B AAN, ABY and ADU) engines are equipped with an ECU replacement audi key that has to be aware of the speed and position of the crankshaft to make decisions about timing of the fuel injector, for example. To accomplish this, it utilizes a Crank Position Sensor (G4) and an Engine Speed Sensor (G28). If either of these sensors go badly, you will see codes on the diagnostic scanner which can lead to engine shutdown.
Some of the signs of a failed G28 sensor include audi a5 replacement key an inaccurate gearbox rev counter the gears are shifting faster than normal and/or misfiring when you're in gear. If you experience any of these issues, it is likely that your sensor is going bad and requires replacement. The good thing is that they are very affordable and easily accessible, especially if you're looking at an Bosch unit which is what ours are. Alternately, the GM version of this part is also a good option.
5. Tachometer
A failing engine sensor could cause a myriad of issues in your car. It is an important part of the transmission of your Audi, as it transmits information to the ECU regarding how fast or slow the engine of the car is spinning. If the sensor fails, it will affect the performance of the transmission and the other car's components.
The G5 engine speed sensor is located at the edge of the transmission above the flywheel ring gear and sends a signal to the ECU at pin T55/49, via a grey wire. The ECU then processes the signal to control fuel, timig, and boost, and also sends it on to the G5 tachometer in the instrument cluster. You can check for sensor failure by examining the continuity from the sensor to the tachometer. You can also verify continuity between pin T55/49 of the ECU and pin T6a/1 of the instrument cluster (trace [79trace [79]), and between pin T6a/1 as well as pin T26a/12. It should show approximately 1000 ohms resistance between those two pins. This part is common across the Audi 80-100-200-RS2 series, starting beginning with the 1985 get more info MC and up to the 1997 UrS AN and 1995 RS2 DU So, you may find some good ones in wrecking yards.